2.8 Cursor Orientation
The most straight forward and "useful" thing that I managed to find online is as follows:


Select the 3D Cursor tool
Open the properties tab (N), check "surface select" and select "Geometry"





Click on a face: the cursor will stick to that face and orient itself so it's normal to the face





Go to edit mode and select the "Add Box" tool





Click and drag
Poof you've now created a box that is normal to the face you selected




Warning: 3DCursor Tool in Edit mode and object mode are independant so if you click again on the cube in edit mode it will reposition itself based on the configuration of the edit mode's 3D Cursor tool

That's something I found in a Youtube video from "Blender Developers" from a year ago so maybe you can do more things with it now or maybe in the future I don't know.